CA2069364A1 - Intervertebral stabilization device incorporating dampers - Google Patents

Intervertebral stabilization device incorporating dampers

Info

Publication number
CA2069364A1
CA2069364A1 CA002069364A CA2069364A CA2069364A1 CA 2069364 A1 CA2069364 A1 CA 2069364A1 CA 002069364 A CA002069364 A CA 002069364A CA 2069364 A CA2069364 A CA 2069364A CA 2069364 A1 CA2069364 A1 CA 2069364A1
Authority
CA
Canada
Prior art keywords
damper
dish
implants
compression
sense
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002069364A
Other languages
French (fr)
Inventor
Fernand Navas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
"PSI" Ste
Original Assignee
Fernand Navas
Societe "Psi"
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fernand Navas, Societe "Psi" filed Critical Fernand Navas
Publication of CA2069364A1 publication Critical patent/CA2069364A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
    • F16F3/08—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of a material having high internal friction, e.g. rubber
    • F16F3/087—Units comprising several springs made of plastics or the like material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A61B17/7005—Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit in the screw or hook heads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7031—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other made wholly or partly of flexible material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7046—Screws or hooks combined with longitudinal elements which do not contact vertebrae the screws or hooks being mobile in use relative to the longitudinal element
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors
    • A61B2017/606—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like for external osteosynthesis, e.g. distractors, contractors with resilient spring element
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30563—Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S606/00—Surgery
    • Y10S606/907—Composed of particular material or coated
    • Y10S606/908—Bioabsorbable material

Abstract

IN THE PATENT & TRADEMARK OFFICE

PATENT APPLICATION
entitled: Intervertebral stabilization device incor-porating dampers in the name of:
assigned to:

ABSTRACT OF THE DISCLOSURE

An intervertebral stabilization device is dis-closed, made in the form of a damper adapted to resist elastically, on the one hand, an elongation and, on the other hand, an axial compression without buckling, as well as of at least two implants anchored on two adjacent vertebrae.

Description

20~936~

F I ELD OF TH E I NVENT I Olil The present inven-tion relates to intervertebral stabilization devices intended Eor maintaining at least two vertebrae, whose common disc is worn, in sui-table relatlve position.
BACKGROUN~ OF THE INVENTION
It is known -that, in the course of ageing, the intervertebral discs risk wearing, ~ith the result that the movements of the intervertebral articulation change, becoming abnormally more ample. The vertebrae may then move in excessive manner with respect to one another, causing permanen-t displacements as the vertebrae are badly positioned.
The intervertebral disc behaves more like a distri-butor of pressure or a three-dimensional coupler of movements than as a simple absorber of longitudinal loads.
The intervertebral movement is guided by the set of posterior articulations. The latter have only ?0 one degree of freedom; the twosurfaces being able only to slide on each other.
During this movement, the disc deforms elastically, progressively braking the movement and dampening it completely at the end of amplitude.
The disc presents a visco-elastic quality. It progressively adapts by viscosity to a new anatomical relation. Consequently, the return movement is then taken over by a similar progressive damper, and this rapidly from its origin.
The set oE the articular facets may be asymmetrical and consequently may create a three-dimensional movement coupling lateral bending and horizontal rotation.
This complex movement is itself coupled to the large movement of bending-extension. In complete bendlng as in complete extension, the amplitude of the combined :

-, . .:: - . . , ~, . .

20693~4 mov--ment (bending-rotation) becomes zero whilst it obtains a maximum ampli-tude in anatomical position, i.e. in the na-tural anatomical relati.on of the vertebrae when one is standing or when one is walking (in Eact, S in an intermediate position between bending and maximum extension).
The biological degrada-tion of the disc disturbs these mechanics of coupled and dampened movements.
This evolution is a source oE discomfort and of pain.
U.S. Patent ~ 743 260, for example, already propo-ses placing between at least two adjacent vertebrae a flexible stabiliza-tion de~Jice composed of two elements fixed to the vertebrae in question. The stabilization elements are made oE a non-metallic material which is resistant but sufficiently flexible to allow at least a normal movement of the backbone.
The stabilization elements in question are provided to be made of a carbon-fiber-reinforced plastics mate-rial, with the result that they present a certain flexibility. However, this latter is limited to very smal] amplitudes in the sense of their curvatures, but they present no elasticity in traction or in compres-sion.
It has thus beèn proposed to place a supple, non-elastic tie between -two vertebrae and which limits like a sudden brake the movement in its amplitude in bending. At -that stage, it behaves like a rigid system, transEerring the mechanical stresses on the adiacent intervertebral articulations.
This comes back to the complications oE mechanical overload as for arthrodeses or rigid metal assemblies.
Furthermore, the degenerative pathological movement between two vertebrae is not only a movement of exagge-: . . , . :: ::

20B93~

rated amplitude but also a sub-tle disorganzation of the three-dimensional coupling of differen-t degrees of freedom.
A simple supple tie can but help, insoEar as it positions the two vertebrae in an extreme amplitude and therefore in extension.
The residual micro-movements then possible thanks to the creeping of the tie are capable of contributing an elementary, rough adaptation with respect to functio-nal needs. However, their existence clearly differen-tiates this fixation with respect to the rigid system (arthrodesis or metallic fixation).
It is an object oE the improvements forming the subject matter of the present invention to produce devices capable of accompanying the ageing of the discs and which therefore constitute prostheses avoiding the drawbacks mentioned hereinabove.
It will be understood that the purpose of the proposed system is to make good the most physiological-ly possible the shortcomings of the disc created by the biological and pathological conditions.
The system proposed aims at obtaining a new stabi-lity Erom an interver-tebral position approaching the neutral position (between bending-extension).
In this position, the possibility of movements of the pos-terior artic~lar surfaces is greater in particu-lar in the sense of extension.
Furthermore, the asymmetrical work of the two posterior surfacesis possible.
The stability of the intervertebral articulation is then obtained thanks to the quality of damper of the device according to the invention.
The role of the latter is to accompany the movement of the articulation by limiting it slightly in bending and by avoiding abnormal displacements. In parallel, ,, . ~, .

whilst maintaining the vertebrae in extension with respect to one another, it avoids too great an abutment of the articular surfaces on one another. The system according to the invention also limits -the closure of the lateral recess r consequently preventing the possible compression of the nerve root.
SUMM~RY OF THE INVENTION
To that encl, the device according to the invention comprises a damper adapted elastically to resist, on the one hand, an elongation and, on the other hand, an axial compression, said damper being associated with at least two implants anchored on two adjacent vertebrae.
The damper takes the form of an elongated body provided with a bulged central part joined by two necks to two swollen ends cooperating with the implants.
In this way, the damper according to the inven~ion may exert a distracting or compressive force, which enables it to act permanently on the poor intervertebral pOsition-In other~words, the stabiliæation device accordingto the invention guides and limits the movement of the intervertehral articulation, whilst being capable of exerting permanent forces modifying the position of the vertebrae with respect to one another.
The stabilization device according to the invention is capable of damping the movement in bending and that in extension and, consequently, of allowing asymme-trical work of the surfa~esof the vertebrae whilst allowing the resultant three-dimensional coupled move-ment.
In this way, one approaches a complex and damped physiological movement.
Of course, one single device according to the invention, or several, may be used to join two adjacent 2~S93~

vertebrae.
BRIEF DESCRIPTION OF T~IE DR~WINGS
The invention will be more readily unders-tood on reading the following description wi-th reference to the accompanying drawings, in which:
Figure 1 is a view in perspective~ oE the diEferent elements constituting a stabilization device according to the invention.
Figure 2 is a view from behind of three vertebrae associated with the stabilization devices according to the invention.
Figure 3 is a section aIong III-III (Figure 2).
Figure 4 is a view in perspective of two bushes adapted to cooperate with the necks of the damper of a device according to the invention.
Figure 5 is a view similar to th~t of Figure 3, but illus-trating the assembly of a device according to the invention in anterior position.
Figure 6 is a very schematic view in section of the prlnciple of a damp~r in accordance with a variant embodiment of the invention.
Figure 7 shows in section, in the free state, the two elements of the damper oE Figure 1.
Figures 8, 9 and 10 are longitudinal sections of two different embodiments oE the damper illustrated in Figure 6~
DET~ILED DESCRIPTION OF THE DRAWINGS
ReEerring now to the drawings, and firstly to Figure 1, the device accordlng to the invention essen-33 tially comprises a damper 1 made of a bio-compatible, elastic materia] and two implants 2 screwed in two adjacent vertebrae and whose free ends are associated with the two ends oE the damper 1.
It is observed that the damper 1 is made in the form of an elongated body provided with a bulged central ,. . ,. i, . . .. . ... ....

- , . . - : , ., part la joined to two necks lb, lc to two swollen ends ld, le. In an advantageous embodiment oE -the preceding arrangement, the bulged par-t la may be provi-ded to be of elliptic longitudinal se~tion, whils-t the -two ends ld and lc each -take the form oE a sphe~e.
Of course, the bulged part la may be o~ cylindrical section with two -truncated endpieces or in the form of two frustums of cone or may be asymmetrical in particular applications.
Each implant 1 firstly comprises a screw 2a adapted to be screwed in the pedicle of a vertebra or in any other location thereof. ~'he screw 2a extends by a cylindrical body 2b which terminates in a hollow dish 2c of cylindrical shape with a tapped inner wall 2d and a concave bottom 2e presenting a shape complementary to that of half the end ld, le of the damper. It is observed that the disc 2c is provided with a lateral notch 2f adapted to allow passage oE the neck lb, lc of the damper 1 for positioning the latter with respect to the implan-ts. Locking of the ends of the damper 1 is effected after they have been placed in the dishes 2c by screwing a threaded endpiece 3 inside the corresponding~dish with respect to the tapped wall 2d. Of course, the base 3a of the endpiece 3 is provided to be concave and hemi-spherical, so as to cooperate exactly with the spherical ends ld, le of the damper. Figures 2 and 3 illustrate the assembly of a device according to the invention with respect to two adjacent vertebrae 4 and 5 of a spine.
On the right-hand side of Figure 2, a device has been illustrated, comprising one damper 1 associated with two implants 2 each fastened to a vertebra 4, The same assembly may be provided in the left-hand part. In addition, it is possible that three successive vertebrae 4, 5, 6 need stabilization. In that case, one of the implants 2' comprises two diametrally oppo-, :, : :: : :: ,: . , , ; -, .

site notches 2'f, whilst the ends of the two dampers 1' each comprise one end l'd, l'e, truncated along a diametral plane oE the sphere perpendicula~ -to the lon~itudinal axis of the damper in order tha-t the two truncated ends l'd, l'e may be re-tained in the dish of the implant 2' (cE. the leEt-hand part of Figure 2).
Figure 3 shows in very detailed manner the struc-ture of the assembly of the ends of the damper with two implants. The hollow dish 2c with bellied concave base 2e is found again, as well as the endpiece 3 with bellied concave base 3a in order that the two spherical ends lc, ld of the damper 1 be suitably locked with respect to the implan~s 2. Such locking makes it possible to create a sort of ball-joint articu-lation facilitating the movements of the s~ine.
~ s i~lIustrated in Figure 4, the necks lb, lc of the damper 1 are advantageously pro-tected by a bush 7 made of metal or any other rigid material and which ensures the mechanical quality of the relation between the damper and the implants. The bushes 7 may comprise on their inner faces notches which inter-vene actively, reducing mechanical efforts at the level of the corresponding neck.
As illustrated in Figures 2 and 3, the stabiliza-tion device according to the invention is positioned either on the posterior face or on the lateral face of the vertebrae. It may also be used at the front of the vertebral body, as illustrated in Figure 5.
In this mode of positioning, it goes without saying that the implants 2 must be disposed laterally outside the vessels or the device will be placed~as illustrated in Figure 5, i.e. embedded in the vertebrae.
In that case, a slight resection of the inter-vertebral disc 8 is made to constitute a depression 2~9364 8a therein. The implants 2 are driven deeply in the vertebra so that their dish 2c is embedded in the vertebra which is itself notched at 4a, Sa in order to allow passage of the ~wo necks oE the damper. It is thus sure that the device does not inter~ere wi-th the vessels l~ca-ted al~ng the anterior face of the spine.
The dampers may be provided with different lengths varying from some millimeters with respect to one another so that the length of the damper can be adjusted to the anatomical pathology of the pa-tient.
A stabilization system has thus been produced, makinc3 it possible to obtain a set of the residual intervertebral movements necessary for the elementary physiology of the spine, whilst eliminating th~ bad positions of the vertebrae and abnormal movements thereof.
Any appropria-te material may be used for making the damper l, in par-ticular a bio-compatible elastomer.
A composite material may also be adopted, optimally responding to the two mechanical requirements of the damper, viz. the resistance to longitudinal traction ~nd to a compression without buckling. The materials chosen may be of the sarne famil~ or totally different.
The principle of the damper made of a composite material is illustrated in Figures 6 and 7. The damper, referenced lO, comprises two elements 11 and 12 both made of bio-compatible elastic materials. ~he first element ll is in the form of a spool of which the distance betwee~n the flanges is reEerenced L in the Eree state. The second element, referenced 12, takes the form of a tubular sleeve of height H in the free state. Assembly of the damper consists in placing element 12 between the flanges of t~e element ll after the latter has been elongated. Therefore, the element - , , - ~

g 11 compresses by its flanges the element 12 in the sense of compression, whilst the lat-ter maintains element 11 in a pre-tensioned position. In this way, the leng-th 1 of the sleeve after assembly and which corresponds to the distance between the flanges of element 12 is defined by the relation L ~ 1 < ~l.
In a first practical embodiment illustr~ted in Figure 8, element 11' or core takes the form of dumb-bells, whilst element 12 is made in the Eorm of a body 12' whose general shape is that of -the centre of the damper 1 of Figures 1, 2 and 3.
In order to produce such a damper, the core 11' is firstly made. The rod thereof is elongated elastical-ly in the axial sense, then the body 12' is moulded on t'nis core. ~fter manufacture, -the core ll'a is pre-tensioned, whilst the body 12' is pre-compressed.
It will be noted that -the core 11' and the body 12' are joined by means of two bushes 7 in the form of diabolos, the ends of the core 11' projecting beyond the ends of the body 12', whilst the two spherical heads ll'a, ll'b of said core correspond to the spheres ld, le of the damper 1.
In a second embodiment illustrated in Figure 9, the damper referenced 10", comprises an elastic envelope 11" of which the outer shape corresponds to that of the damper 1, as well as a block of elastic material 12". ~fter manufacture, the envelope 11"
~which comprises a hollow inner cavity,~ is elongated so as to increase the height of its cavity in which the block 12" is introduced via a lateral opening ll"a or the like. The envelope ll" is consequently pre-tensioned in the sense of~elongation, whilst the block 12" is pre-compressed by the action o the enve-lope.
Finally, in a practical embodiment illustrated . .

206936~

in Figure 10, the damper 100 comprises a body 120 which is mounted on an element 110 in the Eorm of dumb-bells as already shown in Figure 8. Th~ element 110 and the body 120 are jo.ined by means oE -two sleeves 70 in the form of diabolos of which one oE their ends abuts against the spherical heads llOa and llOb of the element 110 corresponding to the spheres ld, le of the damper 1. The other ends of the sleeve~ 70 are respectively curved towards the outside of the damper 100 in order to form a circular free space inside which is introduced an O-ring 130. This latter makes it possi.ble to compensate the efforts of compres-sion of the~damper 100.
It is ascertained that the O-ring 130 may be made of a bio-compatible material similar to that of the body 12 so as to be able to resist the efforts of compression. The O-ring 30 and the dumb-bell shaped element llO~may be used toge-ther on the same damper or independently of each other depending on the stresses to be regulatèd.
; The hardness of the elements composing the damper 10', 10" will be chosen so that, under the effect of the forces applied by the vertebrae, none of the e].ements resumes its dimensions in the free state.
In this way, whether the damper is subjected to a force of traction or to a force of compressio!~, it still remains pre-stressed, so that the force which ~ is applied thereto is always da~ped at some point ;~ within the amplitude of the movement imposed on the composite damper.
It must, moreover, be understood that th~ foregoing description has been given only by way of example and that lt in no way limi-ts the domain of the invention which would not be exceeded by replacing the details of executlon described by any other equivalents.

: .

Claims (15)

1. An intervertebral stabilization device, of the type constituted by a flexible element positioned between at least two vertebrae via two implants respec-tively associated with each vertebra, wherein it is made in the form of a damper (1, 10, 10', 10", 100) adapted to resist elastically, on the one hand, an elongation and, on the other hand, an axial compression without buckling, as well as at least two implants (2) anchored on two adjacent verte-brae (4, 5).
2. The device of Claim 1, wherein the damper (1) takes the form of an elongated body provided with a bulged central part (1a) joined by two necks (1b, 1c) to two swollen ends (1d, 1e).
3. The device of Claim 1, wherein the ends of the implants (2) which receive the swollen ends (1d, 1e) of the damper (1) are each in the form of a dish (2c) whose bottom (2e) presents a concave profile of appro-priate shape for close cooperation thereof with the corresponding end (1d, 1e) of the damper (1), said dish comprising means (2d) for fixing an endpiece (3) intended to apply said end against the bottom (2e) of the dish (2c) of the implant (2).
4. The device of Claim 3, wherein the dish (2c) of each implant (2) comprises a tapped hole (2d) of which the bottom (2e) is hemi-spherical, this dish being provided with a notch (2f) so that it opens out laterally towards the outside, the fixation of the end of the damper being effected by means of a threaded endpiece (3) with hemi-spherical base (3a) which is screwed in the dish (2c).
5. The device of Claim 4, wherein it comprises median implants (2') comprising two opposite notches (2'f) for maintaining the ends of two adjacent dampers (1') of which at least one of the ends (1'd, 1'e) is a half-sphere.
6. The device of Claim 2, wherein rigid sleeves or diabolos (7) are placed at the level of the two necks (1b, 1c) of the damper (1).
7. The device of Claim 6, wherein the damper (1, 10, 10', 10", 100) is made of a bio-compatible elastic material such as an elastomer.
8. The device of Claim 6, wherein the damper (1, 10, 10', 10", 100) is made of a bio-compatible material with two components.
9. The device of Claim 2, wherein the bulged part (1a) of the damper (1) presents an elliptic form in longitudinal section.
10. The device of Claim 2, wherein the bulged part (1a) of the damper (1) is asymmetrical.
11. The device of Claim 8, wherein one of the two elements of the damper (10, 10', 10", 100) is pre-stressed in the sense of extension and the second element in the sense of compression.
12. The device of Claim 11, wherein its damper (10') comprises an elastic core (11') made in the form of a dumb-bell of which the rod is elastically elongated as well as a body (12') pre-stressed in the sense of compression by the elasticity of the core (11').
13. The device of Claim 11, wherein its damper (10") is made in the form of an elastic envelope (11") pre-tensioned elastically in the axial sense with a view to elongating it and which comprises a cavity containing a block of elastic material (12") that the envelope pre-stresses by compression.
14. The device of Claim 11, wherein its damper (100) comprises an element (110) and a body (120) joined by two sleeves (70) in the form of diabolos of which one of their ends is curved towards the outside to form a circular free space inside which is introduced an O-ring (130).
15. The device of Claim 14, wherein the O-ring (130) is made of a bio-compatible material sufficiently resistant to be able to compensate the efforts of compression.
CA002069364A 1991-05-30 1992-05-25 Intervertebral stabilization device incorporating dampers Abandoned CA2069364A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106695A FR2676911B1 (en) 1991-05-30 1991-05-30 INTERVERTEBRAL STABILIZATION DEVICE WITH SHOCK ABSORBERS.
FR9106695 1991-05-30

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CA2069364A1 true CA2069364A1 (en) 1992-12-01

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EP (1) EP0516567B1 (en)
JP (1) JP3256281B2 (en)
KR (1) KR100209073B1 (en)
AT (1) ATE155333T1 (en)
AU (1) AU651209B2 (en)
CA (1) CA2069364A1 (en)
DE (1) DE69220852T2 (en)
ES (1) ES2104879T3 (en)
FR (1) FR2676911B1 (en)

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US5540688A (en) 1996-07-30
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AU651209B2 (en) 1994-07-14
ATE155333T1 (en) 1997-08-15

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